unfortunately it's me again. I have now tried to add the parachute to the custom shop. but unfortunately the parachute is not displayed in the API or in the shop!?
I added the cshop_parachute.amxx to the / plugins folder.
and in the plugins-shop.ini I made the entry cshop_parachute.amxx.
the other addons (norecoil, longjump) are displayed via / shop.